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Recent insights into HIV-1 Vif
Francisco Navarro1, Nathaniel R Landau
1The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA.
Current Opinion in Immunology
|July 13, 2004
Summary
Lentiviruses use a viral infectivity factor (Vif) to counteract a host defense. This defense involves APOBEC3G, an enzyme that damages viral genomes, but Vif neutralizes this innate immunity.
Area of Science:
- Virology
- Immunology
- Molecular Biology
Background:
- Lentiviruses, including HIV-1, encode a viral infectivity factor (Vif) protein.
- Vif's function was hypothesized to neutralize an inhibitory host defense, but its cellular target remained unknown.
- This limited understanding hindered research into retroviral innate immunity.
Purpose of the Study:
- To identify the cellular target of the lentiviral Vif protein.
- To elucidate the mechanism of a novel innate defense against retroviruses.
Main Methods:
- Identification of the host cell factor targeted by Vif.
- Analysis of the interaction between Vif and APOBEC3G within viral particles.
Main Results:
- The identification of the host cell factor revealed a novel innate defense mechanism.
- APOBEC3G, a cytidine deaminase, is encapsidated into assembling virions.
- Vif neutralizes APOBEC3G, preventing it from damaging the viral genome during replication.
Conclusions:
- A new innate defense system against lentiviruses involving APOBEC3G has been uncovered.
- Vif plays a crucial role in antagonizing this host defense, enabling efficient viral replication.
- Understanding this Vif-APOBEC3G interaction is key to developing antiviral strategies.